Improvement in lathe-chucks



UNITED STATES PATENT OFFICE.

JOHN HERRIOT, OF CLEVELAND, OHIO.

IMPROVEMENT IN LATHE-CHUCKS.

Specification forming part of Letters Patent No. 196,525, dated October30, 1877; application filed September 17, 1877.

To all whom it may concern:

Be it known that I, JOHN HERRIOT, of Cleveland, in the county ofOuyahoga, and

State of Ohio, have invented acertain new and Improved Lathe-0huck; andI do hereby de- Figure 1 is a View of the face of the chuck. I

Fig. 2 is an edge view of the same.

Like letters of reference refer to like parts in the several views.

This invention is a chuck for lathes; and the special object of the sameis to afford a secure and convenient means of holding the packingringsof steam-engine pistons for turning and fittingthe same to the piston,and for the redressing of said rings when they have become worn.

The construction of said invention and the operation of the same aresubstantially as follows:

On referring to the drawing, A represents a face-plate, of greater orless diameter, as the size of the packing-rings may require. In saidplate are radial slots B, in which are fitted, so as to slide freelytherein, lugs O. Said lugs are retained in place by pieces D, Fig. 2,sliding on the back of the faceplate, and secured to the lugs by screwsor otherwise.

It will be seen, on examination of Fig. 2, that the lugs are bifurcated.In the inner arm of the lugs is an adjusting-screw, E; so also in theouter arm of the lug is an adjustingscrew, F. To the end of saidadjusting-screw F is attached a sliding gib, Gr,'as shown in thedrawing.

The practical operation of the above-described device will be readilyunderstood on examination of the drawings, and which is substantially asfollows: The difficulty expelathe, and ordinarily requires much time,care,

and labor to secure them in the lathe for that purpose. The ordinarychuck and other devices in which the uncut rings are finished are notadapted to this end; hence resort is to expedients more or lessinsufiicient. To meet this want is the object of the chuck hereindescribed, and which is screwed to the mandrel of the lathe, forming aface-plate to the same.

The ring H referred to is placed between the arms of the lugs C, so thatthe edge of the ring will rest against the back thereof. The back ofeach lug being equally distant from the face-plate, the edge of the ringwill, therefore, be set true in the lathe.

The peripheral adjustment of the ring is ,made by the set-screws E F andgib G, and

which, when properly adjusted, is firmly held thereby from springingWhile being turned, as shown in the drawings.

In the drawing three lugs only are represented; but more may be added,as the size of the packing-ring mayrender it necessary. The slots B arefor that purpose.

What I claim as my invention, and desire to secure by Letters Patent, is

In combination with the face-plate A, the bifurcated lugs 0, providedwith the adjustingscrewE and adj listing-screw F, having secured theretoa sliding gib, G, substantially in the manner as described, and for thepurpose speci fied.

JOHN HERRIOT. Witnesses:

J. H. BURRIDGE, JAs. G. HERRIOT.

